102 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 16 



(1), 1948-50 (1). Bottom sample 2034 (1). Hubbs 47-1 3B (3). Cat. 

 nos. 65.1-65.11. 



Distribution: Off San Benito Islands; Ranger Bank, off Cedros 

 Island; south-southwest of Natividad Island; 8.5 mi SSE Point Fermin; 

 off Bird Rock, San Diego Co., Calif. Bathymetric range, 55-125 fms. 



Dendrophyllia cortezi Durham and Barnard, new species 



Plate 16, figs. 66a, b 



Corallum arborescent, of moderately large size, axial stalk solid 

 except for commensal boring organism ; calices large, terminal, individual 

 lateral calices from 6-9 mm in length ; walls of calices in terminal parts 

 moderately porous, becoming solid below; calices subcircular to oval in 

 cross-section with maximum diameters of from 10-13 mm, fossae 3-4 mm 

 deep ; septa subequal, in 4 cycles, with some members of fifth cycle pres- 

 ent, in typical balanophylloid pattern; septal interspaces twice as wide 

 as thickness of primary septa; septa slightly exsert, first and second 

 cycles most prominently so, other cycles successively less exsert ; first and 

 second cycle septa well-rounded above, descending sharply into fossa and 

 attached to columella somewhat at depth, upper edges of later cycles of 

 septa irregular, third cycle septa not attached at depth to columella; 

 septal faces well-covered with small granules ; inner edges of third cycle 

 septa coarsely dentate, fourth cycle septa occasionally very porous, inner 

 edges of fifth cycle septa lacerate; costae granulated, corresponding to 

 septa, those of first and second cycles slightly more prominent than those 

 of later cycles; costal interspaces moderately deep, bottoms usually 

 rounded and about half the width of the costae; columella elongate, of 

 moderate size, about one-fourth to one-third the diameter of the calice, 

 rounded and projecting slightly above bottom of fossa. 



Remarks: This species may be distinguished from D. calif ornica 

 Durham by the inner margins of the third cycle septa being coarsely 

 dentate, by the greater variation in the prominence of the costae, and 

 by the longer lateral cah'ces. It is separated from D. oldroydi Faustino 

 by the dentate third cycle septa, by the longer and more slender cahces, 

 and by the upper margins of the calice being much less serrate in appear- 

 ance. The inner edges of the third cycle septa are vertical in D. cortezi, 

 while they are slanting in D. oldroydi. The wall of the latter is second- 

 arily thickened with stereome up to the top of the calice; in D. cortezi 

 it remains perforate for some distance below. There is less differentiation 

 in the size of the costae of D. cortezi than of D. oldroydi. 



Dimensions of holotype: Height of corallum 120 mm, length of a 

 single corallite 23 mm, diameters 9 and 12 mm, depth of calice 4 mm. 



